1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Fittoniya [83]
3 years ago
9

Which statement best describes the equation CaCO3 + 2HCl → CaCl2 + CO2 + H2O? CaCO3 is a reactant; it is present before the reac

tion occurs. CaCl2 is a reactant; it is present before the reaction occurs. CO2 is a reactant because it is most likely a gas. H2O is a reactant because it is most likely a liquid.
Physics
2 answers:
Marat540 [252]3 years ago
6 0

Answer:

CaCl2 is a reactant

Explanation:

Calcium carbonate (CaCO3) is a reagent, it is found on the left side, what is found on the right side are the products.

azamat3 years ago
4 0

Answer : The correct statement is, CaCO_3 is a reactant; it is present before the reaction occurs.

Explanation :

The given balanced chemical reaction is,

CaCO_3+2HCl\rightarrow CaCl_2+CO_2+H_2O

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.

In the chemical reaction, the reactants and products are separated by right arrow.

The species present on the left side of the right arrow is the reactant and the species present on the right side of the right arrow is the product.

In the given balanced reaction,

CaCO_3 and HCl are reactants.

CaCl_2, CO_2 and H_2O are products.

Hence, the correct statement is, CaCO_3 is a reactant; it is present before the reaction occurs.

You might be interested in
An automobile traveling 95 km/h overtakes a 1.30-km-long train traveling in the same direction on a track parallel to the road.
SOVA2 [1]

Answer:

Same direction: t=234s; d=6.175Km

Opposite direction: t=27.53s; d=0.73Km

Explanation:

If the automobile and the train are traveling in the same direction, then the automobile speed relative to the train will be v_{AT}=v_A-v_T (<em>the train must see the car advancing at a lower speed</em>), where v_A is the speed of the automobile and v_T the speed of the train.

So we have v_{AT}=(95km/h)-(75Km/h)=20Km/h.

So the train (<em>anyone in fact</em>) will watch the automobile trying to cover the lenght of the train L at that relative speed. The time required to do this will be:

t = \frac{L}{v_{AT}} = \frac{1.3Km}{20Km/h} = 0.065h=234s

And in that time the car would have traveled (<em>relative to the ground</em>):

d=v_At=(95Km/h)(0.065h)=6.175Km

If they are traveling in opposite directions, <u>we have to do all the same</u> but using v_{AT}=v_A+v_T (<em>the train must see the car advancing at a faster speed</em>), so repeating the process:

v_{AT}=(95km/h)+(75Km/h)=170Km/h

t = \frac{L}{v_{AT}} = \frac{1.3Km}{170Km/h} = 0.00765h=27.53s

d=v_At=(95Km/h)(0.00765h)=0.73Km

5 0
3 years ago
What travels with a sound wave matter, energy or both?
il63 [147K]
Energy travels with sound waves.
8 0
3 years ago
Read 2 more answers
The electric field strength in the space between two closely spaced parallel disks is 1.0 105 N/C. This field is the result of t
balu736 [363]

Answer:

D=2.996\times 10^{-2} m

Explanation:

*Assume the parallel disks have equal diameters.

Given the electric strength as  1.0\times 10^5 N/C.  transferring 3.9\times 10^9 electrons, the disk's Area can be calculated using the formula:

E=\frac{\eta}{\epsilon_o}=\frac{Q}{A\epsilon_o}\\\\A=\frac{Q}{E\epsilon_o}\\\\=\frac{(3.9\times 10^9)\times (1.6\times10^{-19})}{(1.0\times 10^5 )\times (8.85\times10^{-12})}\\\\A=7.0508\times 10^{-4} \ m^2

#We now calculate the disks diameter:

A=\pi(D/2)^2\\\\2\sqrt{\frac{A}{\pi}}=D\\\\=2\sqrt{7.0508\times 10^{-4}/\pi}\\\\D=2.996\times 10^{-2} \ m

Hence, the diameter of the disks is D=2.996\times 10^{-2} m

8 0
3 years ago
Which of the following terms describes a machine that converts heat into work?
NemiM [27]
The answer is A. Entropy pump
7 0
3 years ago
Read 2 more answers
For questions 1-10 fill in the blank with the letter of the description that best matches the term
tigry1 [53]
B-Pitcher C-Catcher H-Strike I-Umpire G-Strike Zone E- Foul Ball F- Ball J- Pick-off D-Error A- Shortstop. I think (Sorry for them being out of order. I had to break them down)
4 0
3 years ago
Read 2 more answers
Other questions:
  • An aluminum "12 gauge" wire has a diameter d of 0.205 centimeters. The resistivity ρ of aluminum is 2.75×10−8 ohm-meters. The el
    13·1 answer
  • Which explanation describes the forces involved for a person to walk down the sidewalk? A. The person's feet push backward on th
    11·2 answers
  • Which organism in the food chain is sometimes first level consumer and sometimes 2nd level
    15·1 answer
  • The importance of latitude and longitude
    8·1 answer
  • Help me with Economics please and thank you the question is going to be down in a attached file while the answers on here
    7·2 answers
  • This force is involves the attraction between charged particles
    13·2 answers
  • A football player kicks a football in a field goal attempt. When the football reaches its maximum height, what is the relationsh
    6·2 answers
  • ______________ is a physical property and can be _______________ or _____________.
    6·1 answer
  • Which refers to the area on the thermometer marked with the letter A? scale bulb mercury strip number line
    14·2 answers
  • Discuss one social problem in the world today. What do you think should be done to help solve this social problem?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!